// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2009-2015 Cavium, Inc.
 */

#include <linux/gfp.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_mdio.h>
#include <linux/phy.h>
#include <linux/platform_device.h>

#include "mdio-cavium.h"

static int octeon_mdiobus_probe(struct platform_device *pdev)
{
        struct cavium_mdiobus *bus;
        struct mii_bus *mii_bus;
        union cvmx_smix_en smi_en;
        int err;

        mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
        if (!mii_bus)
                return -ENOMEM;

        bus = mii_bus->priv;
        bus->mii_bus = mii_bus;

        bus->register_base = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(bus->register_base)) {
                dev_err(&pdev->dev, "dev_ioremap failed\n");
                return PTR_ERR(bus->register_base);
        }

        smi_en.u64 = 0;
        smi_en.s.en = 1;
        oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);

        bus->mii_bus->name = KBUILD_MODNAME;
        snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%px", bus->register_base);
        bus->mii_bus->parent = &pdev->dev;

        bus->mii_bus->read = cavium_mdiobus_read_c22;
        bus->mii_bus->write = cavium_mdiobus_write_c22;
        bus->mii_bus->read_c45 = cavium_mdiobus_read_c45;
        bus->mii_bus->write_c45 = cavium_mdiobus_write_c45;

        platform_set_drvdata(pdev, bus);

        err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
        if (err)
                goto fail_register;

        dev_info(&pdev->dev, "Probed\n");

        return 0;
fail_register:
        smi_en.u64 = 0;
        oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
        return err;
}

static void octeon_mdiobus_remove(struct platform_device *pdev)
{
        struct cavium_mdiobus *bus;
        union cvmx_smix_en smi_en;

        bus = platform_get_drvdata(pdev);

        mdiobus_unregister(bus->mii_bus);
        smi_en.u64 = 0;
        oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
}

static const struct of_device_id octeon_mdiobus_match[] = {
        {
                .compatible = "cavium,octeon-3860-mdio",
        },
        {},
};
MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);

static struct platform_driver octeon_mdiobus_driver = {
        .driver = {
                .name           = KBUILD_MODNAME,
                .of_match_table = octeon_mdiobus_match,
        },
        .probe          = octeon_mdiobus_probe,
        .remove         = octeon_mdiobus_remove,
};

module_platform_driver(octeon_mdiobus_driver);

MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
MODULE_AUTHOR("David Daney");
MODULE_LICENSE("GPL v2");